speaking to me earlier -- gabriel gatehouse speaking to me earlier. he had been described as a visionary and one of the greatest leaders of our time. here in the u.s., tributes have been coming in from those who knew him or who simply felt his influence and former president george w. bush and his wife laura will join the obama's when they travel to south africa. we have this report. >> the flag at the white house flies at half mast in honor of a man who means much to america. inside on the desk of the u.s.'s thereblack president sits out oh, a memento of their first meeting. when obama visited the present on robben island in south africa he told his doubters of the link mandela, gandhi, and martin luther king. >> we will not likely see the likes of nelson mandela again. it will fall to us as best we the example that he set. to make decisions guided not by hate but by love. also do not discount the difference one person can make to drive for future that is worthy of his sacrifice. >> nelson mandela was feted in washington but his struggle against apart